feat: show obsoleted message when 0 results (#200)

* feat: show obsoleted message when 0 results

* chore: linting

feat: doi full url

feat: rfc/subseries page title

feat: reduce text size for last updated

feat: subseries title formatting (#198)

feat: subseries page refinement (#195)

feat: info subseries pages (#194)

fix: removing leading <br>s from rfc html plaintext

feat: search SPA nav (#189)

* feat: search SPA nav

* fix: dark mode no results

* chore: removing debug

fix: rfc link preview formatting fixes